WO2021005770A1

WO2021005770A1 - Terminal and wireless communication method

Info

Publication number: WO2021005770A1
Application number: PCT/JP2019/027421
Authority: WO
Inventors: 優元 ▲高▼橋; 翔平吉岡; 聡永田; リフェワン
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2019-07-10
Filing date: 2019-07-10
Publication date: 2021-01-14
Also published as: CN114365558A; EP3998815A1; US20220295519A1; JP7337928B2; JPWO2021005770A1

Abstract

An embodiment of a terminal according to the present disclosure comprises: a reception unit that receives information for indicating transmission of an uplink shared channel; and a control unit that, when the uplink shared channel is divided into a plurality of segments and transmitted, performs control such that at least one of a redundancy version which is different from a redundancy version set to the uplink shared channel and a value which is different from a parameter value related to overhead set to the uplink shared channel is applied to at least one segment.

Description

Terminal and wireless communication method

The present disclosure relates to terminals and wireless communication methods in next-generation mobile communication systems.

In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been specified for the purpose of further high-speed data rate, low latency, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel.10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

A successor system to LTE (for example, 5th generation mobile communication system (5G), 5G + (plus), New Radio (NR), 3GPP Rel.15 or later, etc.) is also being considered.

In the existing LTE system (for example, 3GPP Rel.8-14), the user terminal (UE: User Equipment) is based on the downlink control information (DCI: Downlink Control Information, DL assignment, etc.) from the base station. , Controls the reception of downlink shared channels (for example, PDSCH: Physical Downlink Shared Channel). Further, the user terminal controls transmission of an uplink shared channel (for example, PUSCH: Physical Uplink Shared Channel) based on DCI (also referred to as UL grant or the like).

It is considered that future wireless communication systems (eg, NR) will support scheduling of at least one (also referred to as channel / signal) of a given channel and signal across a slot boundary at a given transmission opportunity. Has been done. The channel / signal may be, for example, a shared channel (eg, uplink shared channel (eg, PUSCH)) or downlink shared channel (eg, PDSCH).

In this case, it is considered that the UE controls transmission or reception by dividing the shared channel scheduled across the slot boundary (or across the slot boundary) into a plurality of segments. However, the problem is how to control the shared channel when transmitting or receiving by dividing it into segments.

One of the purposes of the present disclosure is to provide a terminal and a wireless communication method capable of appropriately performing communication even when a predetermined channel / signal is divided and transmitted or received.

The terminal according to one aspect of the present disclosure has a receiving unit that receives information instructing transmission of an uplink shared channel, and when the uplink shared channel is divided into a plurality of segments and transmitted, the terminal is described for at least one segment. It is characterized by having a redundant version different from the redundant version set in the uplink shared channel, and a control unit for controlling to apply at least one of the parameter values related to the overhead set in the uplink shared channel and different values. And.

According to one aspect of the present disclosure, communication can be appropriately performed even when a predetermined channel / signal is divided and transmitted or received.

FIG. 1 is a diagram showing an example of allocation of a shared channel (for example, PUSCH). FIG. 2 is a diagram showing an example of multi-segment transmission. FIG. 3 is a diagram showing an example of an MCS table. FIG. 4 is a diagram showing an example of a redundant version applied to a plurality of PUSCH transmissions (for example, repeated PUSCHs). 5A-5E are diagrams showing an example of transmission conditions or transmission parameters applied to a plurality of segments. FIG. 6 is a diagram showing other examples of transmission conditions or transmission parameters applied to a plurality of segments. FIG. 7 is a diagram showing other examples of transmission conditions or transmission parameters applied to a plurality of segments. FIG. 8 is a diagram illustrating a self-decoderable redundant version. FIG. 9 is a diagram showing an example of RV applied to a plurality of segments. FIG. 10 is a diagram showing another example of RV applied to a plurality of segments. FIG. 11 is a diagram showing another example of RV applied to a plurality of segments. FIG. 12 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 13 is a diagram showing an example of the configuration of the base station according to the embodiment. FIG. 14 is a diagram showing an example of the configuration of the user terminal according to the embodiment. FIG. 15 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.

(Multi-segment transmission)
In an existing system (eg, 3GPP Rel.15), the UE refers to an uplink shared channel (eg, PUSCH) or a downlink shared channel (eg, PDSCH) for a transmission occasion (also referred to as period, opportunity, etc.). It has been considered to allocate time domain resources (eg, a predetermined number of symbols) within a single slot.

The UE may transmit one or more transport blocks (Transport Block (TB)) at a certain transmission opportunity using the PUSCH assigned to a predetermined number of consecutive symbols in the slot. The UE may also transmit one or more TBs at a transmission opportunity using the PDSCH assigned to a predetermined number of consecutive symbols in the slot.

On the other hand, in future wireless communication systems (for example, Rel.16 or later), time domain resources may be allocated across slot boundaries (or across a plurality of slots) for PUSCH or PDSCH of a certain transmission opportunity. Assumed (see Figure 1). FIG. 1 shows a case where PUSCHs are assigned across (or crossing) a slot boundary in addition to PUSCHs assigned to a predetermined number of consecutive slots (7 symbols in this case) in one slot.

Specifically, the PUSCHs assigned to the symbols # 10 to # 13 of slot #n and the symbols # 0 to # 3 of slot # n + 1 are transmitted across the slot boundary. Further, as shown in FIG. 1, when the PUSCH is repeatedly transmitted over a plurality of transmission opportunities, it is assumed that at least a part of the transmission opportunities or the repeated transmissions are transmitted across the slot boundary.

Channel / signal transmission using time domain resources allocated across slot boundaries (over multiple slots) includes multi-segment transmission, 2-segment transmission, cross-slot boundary transmission, discontinuous transmission, multiple division transmission, etc. be called. Similarly, reception of channels / signals transmitted across slot boundaries is also referred to as multi-segment reception, two-segment reception, cross-slot boundary reception, discontinuous reception, multiple division reception, and the like.

FIG. 2 is a diagram showing an example of multi-segment transmission. Although the multi-segment transmission of PUSCH is illustrated in FIG. 2, it may be replaced with another signal / channel (for example, PDSCH or the like). In the following description, the case where each segment is divided based on the slot boundary is shown, but the criterion for dividing into each segment is not limited to the slot boundary. Further, in the following description, the case where the symbol length of PUSCH is 7 symbols is shown, but the present invention is not limited to this, and any symbol longer than 2 symbol lengths can be similarly applied.

In FIG. 2, the UE may control the transmission of the PUSCH allocated (or scheduled) in one slot or the PUSCH allocated across a plurality of slots based on a predetermined number of segments. When the time domain resource over one or more slots is allocated to the PUSCH at a certain transmission opportunity, the UE may divide (or split, split) the PUSCH into a plurality of segments to control the transmission process. For example, the UE may map each segment divided relative to a slot boundary to a predetermined number of assigned symbols in the slot to which each segment corresponds.

Here, the "segment" may be a predetermined number of symbols in each slot assigned to one transmission opportunity or data transmitted with the predetermined number of symbols. For example, if the first symbol of the PUSCH assigned in one transmission opportunity is in the first slot and the last symbol is in the second slot, for the PUSCH, one or more symbols contained in the first slot are used in the first segment. , One or more symbols contained in the second slot may be the second segment.

Note that the "segment" is a predetermined data unit and may be at least a part of one or a plurality of TBs. For example, each segment is composed of one or more TBs, one or more code blocks (Code Block (CB)), or one or more code block groups (Code Block Group (CBG)). May be good. Note that 1CB is a unit for coding TB, and TB may be divided into one or a plurality (CB segmentation). Further, 1 CBG may include a predetermined number of CBs. The divided segment may be called a short segment.

The size (number of bits) of each segment may be determined based on, for example, at least one of the number of slots to which PUSCH is allocated, the number of allocated symbols in each slot, and the ratio of the number of allocated symbols in each slot. Also, the number of segments may be determined based on the number of slots to which the PUSCH is allocated.

For example, PUSCHs assigned to symbols # 5 to # 11 of slot #n are transmitted within a single slot (single segment) without straddling slot boundaries. In this way, the transmission of PUSCH without straddling the slot boundary (transmission of PUSCH using a predetermined number of symbols assigned in a single slot) is a single-segment transmission and one segment (one-). It may be called segment transmission, non-segmented transmission, or the like.

On the other hand, the PUSCHs assigned to the symbols # 10 to # 13 of slot #n and the symbols # 0 to # 2 of slot # n + 1 are transmitted across the slot boundary. In this way, the transmission of PUSCH across the slot boundary (transmission of PUSCH using a predetermined number of symbols assigned in a plurality of slots) is a multi-segment transmission, a two-segment transmission, It may also be called cross-slot boundary transmission or the like.

Further, as shown in FIG. 2, when the PUSCH is repeatedly transmitted over a plurality of transmission opportunities, the multi-segment transmission may be applied to at least a part of the transmission opportunities. For example, in FIG. 2, the PUSCH is repeated twice, the single-segment transmission is applied to the first PUSCH transmission, and the multi-segment transmission is applied to the second PUSCH transmission.

Also, repeated transmission may be performed in one or more time units. Each transmission opportunity may be provided in each time unit. Each time unit may be, for example, a slot or a time unit shorter than the slot (eg, also referred to as a mini slot, subslot, half slot, etc.). For example, FIG. 2 shows repeated transmission using a 7-symbol mini-slot, but the unit of repeated transmission (for example, symbol length) is not limited to that shown in FIG.

Further, the fact that the number of repetitions is 1, may indicate that the PUSCH or PDSCH is transmitted once (no repetition).

In addition, repeated transmission may be referred to as slot-aggregation transmission, multi-slot transmission, or the like. The number of iterations (aggregation number, aggregation factor) N may be specified to the UE by at least one of the upper layer parameter (for example, "pusch-Aggregation Factor" or "pdsch-Aggregation Factor" of RRC IE) and DCI. Also, transmission opportunities, repeats, slots, mini-slots, etc. can be paraphrased with each other.

In this way, when the PUSCH (also called nominal PUSCH) to which the allocation (or schedule) is instructed crosses the slot boundary, or a symbol (for example, 7 symbols) that cannot be used for PUSCH transmission within the range of 1 transmission (for example, 7 symbols). It is assumed that DL or flexible) exists. In such a case, it is conceivable that the UE divides the PUSCH into a plurality of segments (or repetition) to control transmission.

However, when the PUSCH is divided into a plurality of segments and transmitted, how to control the transmission becomes a problem. For example, when the UE transmits PUSCH, transmission is performed using predetermined transmission conditions or transmission parameters, but how to control the transmission conditions or transmission parameters of the divided segments becomes a problem. As an example of the transmission condition, at least one of the transport block size (TBS) and the redundant version (Redundancy Version (RV)) can be considered.

<Transport block size>
FIG. 3 is a diagram showing an example of an MCS table in the future wireless communication system. Note that FIG. 3 is merely an example and is not limited to the values shown, and some items (fields) may be deleted or items not shown may be added.

As shown in FIG. 3, in the future wireless communication system, the modulation order (Modulation order), the coding rate (also referred to as the assumed coding rate, the target coding rate, etc.), the modulation order, and the coding A table (MCS table) associated with an index indicating the rate (for example, MCS index) may be specified (may be stored in the user terminal). In the MCS table, in addition to the above three items, spectral efficiency (Spectral efficiency) may be associated.

The user terminal receives the DCI (DL assignment, at least one of DCI formats 1_0 and 1-11) for scheduling the PDSCH, and is used for the PDSCH based on the MCS table (FIG. 3) and the MCS index included in the DCI. The modulation order (Qm) and the coding rate (R) may be determined.

Further, the user terminal receives the DCI (UL grant, at least one of DCI formats 0_0 and 0_1) for scheduling the PUSCH, and uses the MCS table (FIG. 3) and the MCS index included in the DCI for the PUSCH. The modulation order (Qm) and the coding rate (R) of the above may be determined.

In the future wireless communication system, the user terminal may determine the TBS using at least one of the following steps 1) to 4). In the following steps 1) to 4), the determination of the TBS for PDSCH will be described as an example, but in the determination of the TBS for PUSCH, "PDSCH" in the following steps 1) to 4) will be changed to "PUSCH". It can be replaced and applied as appropriate.

Step 1)
The user terminal determines the number of REs (N _REs ) in the slot.

Specifically, the user terminal may determine the number of RE assigned to PDSCH in 1PRB (N _'RE). For example, the user terminal, based on at least one parameter represented by the following formula (1) may determine the number of RE assigned to PDSCH in PRB (N _'RE).

^{Here, N} _{RB SC} is the number of sub-carriers per 1 RB, for ^example, be a _{N RB} SC = 12. N ^sh _symb is the number of symbols (eg, OFDM symbols) scheduled in the slot.

N ^PRB _DMRS is the number of REs for DMRS per ^PRB within the scheduled period. The number of REs for the DMRS may include group overhead for Code Division Multiplexing (CDM) of the DMRS, as indicated by the DCI (eg, at least one of DCI formats 1_0, 1_1, 0_0 and 0_1). ..

N ^PRB _oh may be a value set by the upper layer parameter. For example, N ^PRB _oh is the overhead indicated by the upper layer parameter (Xoh-PDSCH) and may be any value of 0, 6, 12 or 18. If the Xoh-PDSCH is not set (notified) in the user terminal, the Xoh-PDSCH may be set to 0. Further, in the message 3 (msg3) in the random access procedure, Xoh-PUSCH is set to 0.

Further, the user terminal may determine the total number of _REs (N _RE ) assigned to the PDSCH. User terminal, determined on the basis of the total number of PRB allocated to the number (N _'RE) and the user terminal of RE assigned to PDSCH in PRB _{(n PRB),} the total number of RE assigned to the PDSCH of _{(N RE)} (For example, the following equation (2)) may be used.

The user terminal quantizes the number of RE assigned to PDSCH in 1PRB the (N _'RE) according to a predetermined rule, the total number of PRB allocated to the quantized RE number and a user terminal and _{(n PRB)} The total number of REs assigned to the PDSCH (N _RE ) may be determined based on.

Step 2)
The user terminal determines an intermediate number of information bits _{(intermediate number) (N info)} . Specifically, the user terminal may determine the median number (N _info ) based on at least one parameter represented by the following equation (3). The median number (N _info ) may be referred to as a temporary TBS (TBS _emp ) or the like.

Here, N _RE is the total number of REs assigned to PDSCH. R is the code rate associated with the MCS index included in the DCI in the MCS table (eg, FIG. 3). Q _m is the modulation order associated with the MCS index included in the DCI in the MCS table. v is the number of PDSCH layers.

Step 3)
When the intermediate number ( _Ninfo ) of the information bits determined in step 2) is equal to or less than (or less than) a predetermined threshold value (for example, 3824), the user terminal quantizes the intermediate number and quantizes the intermediate number. The number (N'info) may be determined. The user terminal may calculate the quantized intermediate number (N'info) using, for example, the equation (4).

In addition, the user terminal uses a predetermined table (for example, a table that associates the TBS with the index (also referred to as a quantization table or a TBS table)) and is equal to or larger than the quantized intermediate number (N'info). You may find the closest TBS (not less than).

Step 4)
On the other hand, when the median number (N _info ) of the information bits determined in step 2) is greater than (or greater than or equal to) a predetermined threshold value (for example, 3824), the user terminal quantizes the median number (N _info ). The quantized intermediate number (N'info) may be determined. The user terminal may calculate the quantized intermediate number (N'info) using, for example, the equation (5). The round function may be rounded up.

Here, when the coding rate (R) associated with the MCS index in the DCI in the MCS table (for example, FIG. 3) is equal to or less than a predetermined threshold value (for example, 1/4), the user terminal has a user terminal. , TBS may be determined based on at least one parameter represented by the following formula (6) (for example, using the formula (6)).

N'info is a quantized intermediate number, and may be calculated using, for example, the above equation (5). Further, C may be the number of code blocks (CB: code bock) in which TB is divided.

On the other hand, the coding rate (R) is greater than (or greater than or equal to) a predetermined threshold value (for example, 1/4), and the quantized intermediate number (N'info) of the information bits is a predetermined threshold value (N'info). For example, if it is greater than (or greater than or equal to) 8424), the user terminal determines the TBS based on at least one parameter represented by the following equation (7) (eg, using equation (7)). May be good.

Further, the coding rate (R) is equal to or less than (for example, 1/4) a predetermined threshold value (for example, less than 1/4), and the quantized intermediate number (N'info) is a predetermined threshold value (for example, 8424). If less than (or less than), the user terminal may determine the TBS based on at least one parameter represented by the following equation (8) (eg, using equation (8)).

As described above, in the future wireless communication system, the user terminal has at least the number of _REs (N _RE ), the coding rate (R), the modulation order (Qm), and the number of layers available for PDSCH or PUSCH in the slot. The median number (N _info ) of the information bits is determined based on one, and the TBS for PDSCH or PUSCH is determined based on the median number (N'info) obtained by quantizing the median number (N _info ). Is being considered.

<Redundant version>
When transmitting a plurality of shared channels (for example, PUSCH) or repeatedly transmitting a PUSCH, a predetermined redundant version (RV) is applied to each PUSCH transmission.

When the PUSCH (or TB) is repeatedly transmitted over a plurality of transmission opportunities, the RV applied to the nth transmission opportunity of the TB may be determined based on a predetermined rule. For example, for repeated transmissions of PUSCH scheduled by CRC scrambled PDCCH (or DCI) using a predetermined RNTI, the RV is determined based on the information notified by DCI and the index of transmission opportunity. May be good.

The UE determines the RV (which may be read as RV index, RV value, etc.) corresponding to the nth iteration based on the value of a predetermined field (for example, RV field) in the DCI that schedules the PDSCH iteration. You may. In the present disclosure, the nth repetition may be read as the n-1th repetition with each other (for example, the first repetition may be expressed as the 0th repetition).

For example, the UE may determine the RV index to be applied to the first iteration based on the 2-bit RV field. For example, if the value of the RV field is "00", "01", "10", "11", the RV index of the first repetition is "0", "1", "2", "3", respectively. It may correspond to'.

FIG. 4 is a diagram showing an example of RV mapping for each transmission opportunity. The leftmost column of the table in FIG. 4 shows the RV index (rv _id ) indicated by the RV field. The UE may determine the RV index applied to the nth iteration (transmission opportunity) according to this value.

For example, in the UE, when the rv _id indicated by the RV field is 0, n mod 4 (equivalent to mod (n, 4)) = 0, 1, 2, 3 means rv _id = 0, 2, 3, respectively. It may be judged that it corresponds to 1. That is, the UE may apply the right RV for each iteration of the RV sequence {# 0, # 2, # 3, # 1}, starting from the RV indicated by the RV field.

For PUSCH iterations, only specific RV sequences may be supported. The particular RV sequence may be an RV sequence (eg, RV sequence {# 0, # 2, # 3, # 1}) that includes different RV indexes (does not contain the same RV index). In the present disclosure, the RV sequence may be composed of one or more RV indexes.

Also, for PUSCH iterations, more than 1 RV sequence may be supported. RV sequences greater than 1 include, for example, RV sequences {# 0, # 2, # 3, # 1}, {# 0, # 3, # 0, # 3}, {# 0, # 0, # 0, It may include # 0} and the like. The number of RV sequences applied may be set depending on the transmission type. For example, one RV sequence may be applied to a dynamic-based PUSCH transmission in which PUSCH is scheduled in DCI, and a plurality of RV sequences may be applied to a set grant-based PUSCH transmission.

The UE may set at least one of the more than 1 RV sequences by higher layer signaling for PUSCH iterations. For example, the UE may determine the RV index to be applied to the first iteration from the set RV sequence based on the 2-bit RV field. The UE may determine the RV index applied to the nth iteration (transmission opportunity), as described above in the first mapping, based on the RV index applied to the first iteration.

For example, in a configuration grant-based PUSCH transmission, RV sequences {# 0, # 2, # 3, # 1}, {# 0, # 3, # 0, # 3}, and {# 0, by higher layer signaling. At least one of # 0, # 0, # 0} may be set.

As described above, when transmitting PUSCH, transmission is performed using a predetermined transport block size (TBS), but how to control the TBS of the divided segment becomes a problem. Alternatively, when PUSCH is transmitted, transmission is performed using a predetermined redundant version (RV), but how to control the redundant version of a plurality of divided segments becomes a problem.

The present inventors have studied how to apply transmission conditions or parameters to a plurality of segments of a shared channel, and have reached the present invention.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. In addition, the following first to third aspects may be used individually, or at least two may be applied in combination. The following description will be given by taking an uplink shared channel (for example, PUSCH) as an example, but the applicable signal / channel is not limited to this. For example, the present embodiment may be applied by replacing PUSCH with PDSCH and transmitting with receiving.

Further, the following aspects are at least a shared channel (PUSCH or PDSCH) to which repeated transmission (also referred to as repetition or nominal repetition) is applied, and a shared channel to which repeated transmission is not applied (or the number of repetitions is 1). Applicable to one.

(First aspect)
In the first aspect, when the PUSCH is divided into a plurality of segments and transmission is performed, the transport block size (TBS) applied to each segment will be described.

When the UE divides the PUSCH (also referred to as nominal PUSCH) scheduled or allocated to a predetermined area or a predetermined transmission opportunity into a plurality of segments and transmits the PUSCH, the TBS of each segment after the division is determined based on a predetermined condition. The predetermined condition may be a transmission condition or a transmission parameter including at least one of time, frequency (freq), modulation coding method (MCS), and number of layers (layer). The modulation coding method (MCS) may be at least one of a modulation order (Modulation order) and a coding rate (target code rate).

The UE may control the TBSs of the divided plurality of segments to be the same. Further, the TBS of the PUSCH before the division (also referred to as the original TBS) and the TBS of each segment after the division may be controlled to be the same. By transmitting TB using the same TBS among a plurality of PUSCH transmissions, it becomes possible to appropriately combine a plurality of TBs on the receiving side (for example, a base station on the uplink).

The UE sets the conditions such as time, frequency (freq), modulation coding method (MCS), and number of layers (layer) for the TBS of each PUSCH transmission (for example, single-segment PUSCH or multi-segment PUSCH). It may be decided based on. For example, the TBS may be determined based on step 1) -step 4) described above.

When the PUSCH is divided into a plurality of segments, the allocation in the time direction of each segment (for example, the number of symbols) is smaller than that of the original PUSCH. Therefore, when the TBS of each segment is the same as the original TBS, other transmission conditions or transmission parameters (for example, at least one of frequency, MCS and layer) are changed, or a predetermined MCS index is applied. You may. For example, the UE may change the transmission conditions or transmission parameters applied to each segment based on at least one of the following options 1-1 to 1-5.

<Option 1-1>
The frequency resources to be allocated (eg, number of RBs or number of PRBs) may be increased for at least one of the plurality of segments. That is, in the parameter for determining TBS, since the number of symbols corresponding to the time parameter is reduced by the division, the frequency resource corresponding to the frequency (freq) parameter is increased (see FIGS. 5A and 6).

For example, the UE may allocate by increasing the number of allocated PRBs of at least one of the plurality of segments from the number of allocated PRBs of PUSCH before division (also referred to as the number of original PRBs). The number of PUSCH allocated PRBs before division may be specified by the DCI that schedules the PUSCH.

The number of allocated PRBs for each segment may be controlled to increase by the same number. For example, when the PUSCH is divided into a first segment and a second segment, the number of allocated PRBs in the first segment and the number of allocated PRBs in the second segment may be changed (for example, increased) in common. ..

Alternatively, the number of allocated PRBs for each segment may be controlled to be increased separately. For example, an increasing frequency resource (eg, PRB number) may be determined based on the time resource (eg, number of symbols) of each segment. As an example, the number of PRBs in the first segment having a small number of symbols may be changed to be larger than the number of PRBs in the second segment having a larger number of symbols than the first segment (see the repeated transmission in FIG. 6). ..

Information about the frequency resources applied to each segment (eg, increasing number of PRBs) may be predefined in the specification, or the base station notifies the UE using at least one of higher layer signaling and DCI. You may.

By increasing the frequency resources (eg, the number of PRBs) allocated to each segment in this way, the original PUSCH (eg, the first assigned PUSCH) while maintaining or without increasing the coding rate. Can maintain the same TBS as.

<Option 1-2>
The MCS (eg, at least one of modulation order and code rate) may be increased for at least one of the plurality of segments. That is, in the parameter for determining TBS, the number of symbols corresponding to the time parameter is reduced by the division, so that the MCS is increased (see FIG. 5B). The MCS may be at least one of the modulation order and the coding rate, or may be an MCS index.

For example, the UE may allocate at least one MCS of a plurality of segments by increasing the MCS of the PUSCH before division (also referred to as an original MCS). The MCS of the PUSCH before the division may be specified by the DCI that schedules the PUSCH.

The MCS of each segment may be controlled to increase by the same number. For example, when the PUSCH is divided into a first segment and a second segment, the MCS of the first segment and the MCS of the second segment may be changed (for example, increased) in common.

Alternatively, the MCS of each segment may be controlled to be increased separately. For example, the increasing MCS may be determined based on the time resources of each segment (eg, the number of symbols). As an example, the MCS of the first segment having a small number of symbols may be changed to be larger than the MCS of the second segment having a larger number of symbols than the first segment.

Information about the MCS applied to each segment (eg, increasing MCS) may be predefined in the specification, or the base station may notify the UE using at least one of higher layer signaling and DCI. Good.

By increasing the MCS applied to each segment in this way, it is possible to maintain the same TBS as the original PUSCH (eg, the initially allocated PUSCH) while maintaining or without increasing the allocation of frequency resources. .. Further, since the frequency resource is not changed, it is possible to suppress the complicated allocation control of the segment PUSCH.

<Option 1-3>
A specific MCS index or a specific modulation order may be applied to at least one of the plurality of segments. The particular MCS index may be a reserved MCS index. Further, the specific modulation order may be a fixed value defined in advance in the specifications, or a value notified or set by the base station.

When using a specific MCS index (for example, reserved MCS index), the UE does not use the above-mentioned 4 steps, but instead uses the latest PDCCH (latest PDCCH) for DCI (MCS index is 0 or more and 27 or less). Determined based on. That is, by applying a specific MCS index or a specific modulation order, the original TBS can be maintained without re-calculate.

<Option 1-4>
Spatial resources (eg, number of layers) may be increased for at least one of the plurality of segments. That is, in the parameter for determining TBS, the number of symbols corresponding to the time parameter is reduced by the division, so that the spatial resource is increased (see FIGS. 5D and 7).

For example, the UE may allocate at least one spatial resource (for example, the number of layers) of the plurality of segments by increasing the spatial resource (for example, the number of original layers) of the PUSCH before division. The spatial resource of the PUSCH before division (for example, the number of layers) may be specified by the DCI that schedules the PUSCH.

The number of layers in each segment may be controlled to increase by the same number. For example, when the PUSCH is divided into a first segment and a second segment, the number of layers in the first segment and the number of layers in the second segment may be changed (for example, increased) in common.

Alternatively, the MCS of each segment may be controlled to be increased separately. For example, the number of layers to be increased may be determined based on the time resource (for example, the number of symbols) of each segment. As an example, the number of layers in the first segment having a small number of symbols may be changed to be larger than the number of layers in the second segment having a larger number of symbols than the first segment (see repeated transmission in FIG. 7). ..

Information about the number of layers applied to each segment (eg, increasing number of layers) may be predefined in the specification, or the base station notifies the UE using at least one of higher layer signaling and DCI. You may.

By increasing the number of layers applied to each segment in this way, the same TBS as the original PUSCH (eg, the originally allocated PUSCH) is maintained, with or without the allocation of frequency resources and MCS. be able to. Further, since the frequency resource is not changed, it is possible to suppress the complicated allocation control of the segment PUSCH.

<Option 1-5>
Of the above options 1-1 to 1-4, at least two options may be applied in combination. For example, frequency resources (eg, number of PRBs) and MCS may be increased for at least one of the plurality of segments. That is, in the parameter for determining TBS, the frequency resource and MCS are increased because the number of symbols corresponding to the time parameter is reduced by the division (see FIG. 5E).

In addition, frequency resources and spatial resources may be increased, MCS and spatial resources may be increased, and frequency resources, MCS and spatial resources may be increased. Moreover, the parameter to be increased may be common to a plurality of segments. Alternatively, the parameters that increase for each segment may be set separately.

<UE operation>
When the PUSCH is divided into a plurality of segments for transmission, the UE may autonomously (for example, automatically) adjust the transmission conditions or parameters of each segment. For example, when the scheduled or set PUSCH crosses the slot boundary, the PUSCH may be divided based on the slot boundary, and at least one of the above options 1-1 to 1-5 may be applied to the divided segments. ..

For example, when applying option 1-1, the UE adjusts the number of PRBs in each segment. The UE adjusts the MCS of each segment when applying option 1-2. The UE adjusts the number of layers in each segment when applying options 1-4. The UE adjusts at least two of the PRB number, MCS and layer number of each segment when applying option 1-5.

The UE may apply a predetermined MCS index (eg, MCS = 28, 29, 30, or 31) when applying option 1-3. Which MCS index is applied may be set by higher layer signaling or may be selected based on the code rate. When option 1-3 is applied, the same value as the modulation order notified in the MCS field included in the DCI may be applied as the modulation order.

Alternatively, when the PUSCH is divided into a plurality of segments for transmission, the UE may adjust the transmission conditions or parameters of each segment based on the information notified from the base station. For example, the UE determines transmission conditions or parameters to apply to each segment based on information explicitly notified using at least one of DCI's predetermined fields (eg, new fields) and higher layer signaling. May be good.

Alternatively, the transmission conditions or parameters applied to each segment may be controlled based on the schedule status (or communication status). For example, the UE may control to apply option 1-1 when resources are available in the frequency direction of each segment. Further, when the frequency resource of the original PUSCH (for example, the number of allocated PRBs) is equal to or more than a predetermined value, the UE does not increase the frequency resource and uses another method (for example, any of options 1-2 to 1-4). May be controlled to apply.

Further, when the MCS of the original PUSCH is equal to or less than a predetermined value, the UE controls so that the MCS is not increased and another method (for example, any of options 1-1, 1-3, and 1-4) is applied. You may.

Also, even if option 1-1 is selected to maintain the same TBS and MCS as the original PUSCH, it is possible that an increasing number of PRBs cannot be found. In such a case, the MCS index may be changed by using option 1-5. In this case, the changed MCS index may be changed so as to be in a range close to the original MCS index.

Further, when the coding rate applied to each segment (for example, effective coding rate) is higher than a predetermined value (for example, 0.95), the UE does not transmit the PUSCH (or each segment) (for example,). It may be controlled to skip). By skipping the transmission of the PUSCH segment, which has a low possibility of decoding, it is possible to suppress an increase in the power consumption of the UE (for example, battery saving) and reduce the influence of interference with other cells.

If there is a first segment in which the coding rate is equal to or less than a predetermined value and a second segment in which the coding rate is higher than the predetermined value among the plurality of segments, only the first segment is transmitted (the second segment is not transmitted). ), Or it may be controlled not to transmit both the first segment and the second segment.

Alternatively, the UE may be controlled to transmit the PUSCH (or each segment) regardless of the coding rate applied to each segment. That is, transmission may be controlled even when the coding rate applied to each segment is higher than a predetermined value. In this case, the base station can appropriately decode the PUSCH having a high coding rate by combining with another PUSCH (for example, soft combining).

<Transmission power control>
When the PUSCH is divided into a plurality of segments (segmented PUSCH) for transmission, each segment may be transmitted using the same transmission power as the transmission power set in the PUSCH before division (for example, the original PUSCH). .. In this case, the UE applies the same transmit power to each segment.

Alternatively, when the PUSCH is divided into a plurality of segments (segmented PUSCH) for transmission, each segment is transmitted using a transmission power different from the transmission power set in the PUSCH (for example, the original PUSCH) before the division. May be good. For example, if the transmission power set in the original PUSCH does not exceed a predetermined value (for example, when power is not limited), the transmission power of each segment may be increased (or boosted).

The predetermined value may be the maximum allowable transmission power (Pcmax), and the transmission power of the original PUSCH is equal to or less than the maximum allowable power P _{PUSCH, b, f, c} (I, j, qd, l) ≤ P _{CMAX, When f, c} (i) is satisfied (or within the range not exceeding _{PCMAX, f, c} (i)), the transmission power may be increased.

The value that increases the transmission power (Boosted power value) may be determined autonomously on the UE side (UE implementation), may be defined in the specifications, or the base station notifies the UE by higher layer signaling or the like. May be done. For example, when the coding rate of the segment PUSCH is higher than that of the original PUSCH (for example, it is doubled), the transmission power may be boosted by a predetermined value (for example, 3 dB). As a result, deterioration of communication quality can be suppressed even when the coding rate of each segment is high.

(Second aspect)
In the second aspect, when the PUSCH is divided into a plurality of segments and transmission is performed, a redundant version (RV) applied to each segment will be described.

When the UE divides a PUSCH (also called nominal PUSCH) scheduled or allocated to a predetermined area or a predetermined transmission opportunity into a plurality of segments and transmits the PUSCH, the RV to be applied to each segment after the division is determined based on a predetermined condition. To do. For example, the UE may determine the RV to apply to each segment based on at least one of the following options 2-1 to 2-4.

<Option 2-1>
The same RV may be applied to multiple segments. For example, when the UE divides the PUSCH into a plurality of segments and transmits the PUSCH, the UE applies the same RV to each segment. Further, the RV applied to each segment may be an RV (for example, an original RV) set in the PUSCH before division (for example, the original PUSCH).

The RV of the original PUSCH may be notified by the DCI that schedules the original PUSCH. For example, when the RV notified by the PDCCH (or DCI) that schedules the PUSCH is 0, the UE applies 0 as the RV for a plurality of segments to divide and transmit the PUSCH.

In this way, by determining the RV to be applied to each segment based on the RV set in the PUSCH in advance, the complexity of scheduling can be suppressed.

<Option 2-2>
Different RVs may be applied to multiple segments. For example, when the UE divides the PUSCH into a plurality of segments and transmits the PUSCH, the UE applies different RVs to at least two segments of the plurality of segments. Further, the RV applied to at least one of the plurality of segments may be an RV set in the PUSCH before division (for example, the original PUSCH). The RV applied to the other segments may be selected based on predetermined conditions.

For example, when dividing the PUSCH into two segments (first segment and second segment), the original RV is applied to one of the first segment and the second segment, and the other RV different from the original RV is applied to the other. May be applied. An RV different from the original RV may be determined based on predetermined conditions (for example, any of predetermined conditions 1 to 4 shown below).

The RV of the original PUSCH may be notified by the DCI that schedules the original PUSCH. For example, when the RV notified by the PDCCH (or DCI) that schedules the PUSCH is 0, the UE applies RV = 0 to at least one of a plurality of segments that divide and transmit the PUSCH, and the other. Different RVs (eg, 2) may be applied to the segments of. At least one of the plurality of segments may be the first segment transmitted in the time direction (for example, the first segment).

<Option 2-3>
An RV different from the RV set in the PUSCH before division (for example, the original PUSCH) may be applied to a plurality of segments. In this case, the same RV may be applied to the plurality of segments, or different RVs may be applied.

For example, when the PUSCH is divided into two segments (first segment and second segment), an RV different from the original RV may be applied to both the first segment and the second segment. An RV different from the original RV may be determined based on predetermined conditions (for example, any of predetermined conditions 1 to 4 shown below).

When the same RV (RV different from the RV set in the original PUSCH) is set for each segment, the RV to be applied may be selected based on a predetermined condition. For example, when the RV notified by the PDCCH (or DCI) that schedules the PUSCH is 0, the UE transmits a non-zero RV (for example, RV = 2) to a plurality of segments that divide and transmit the PUSCH. It may be applied.

When different RVs are set for each segment, the RVs to be applied may be selected based on predetermined conditions. For example, the UE may apply a non-zero RV for each segment if the RV notified by the PDCCH (or DCI) that schedules the PUSCH is zero. For example, when there are two segments, the RV of the first segment (for example, the segment transmitted first in the time direction) may be 2, and the RV of the second segment may be 3.

<Option 2-4>
A specific RV sequence may be applied to a plurality of segments. The RV sequence is at least one of {# 0, # 2, # 3, # 1}, {# 0, # 3, # 0, # 3}, and {# 0, # 0, # 0, # 0}. It may be.

As described above, when applying an RV different from the RV set in the original PUSCH before division to the segment PUSCH, the UE may determine the changed RV based on a predetermined condition. When a part of PUSCH of repeated transmission or multiple transmission is divided, only the RV of the divided segment PUSCH may be changed, or the segment PUSCH and another non-divided PUSCH (for example, after the divided segment PUSCH). The RV of PUSCH) transmitted to may be changed.

<When changing only the RV of the segment PUSCH>
[Predetermined condition 1]
The UE may determine the RV to be applied to the plurality of segments divided from the original PUSCH based on a predetermined RV sequence. For example, assume that the RV sequence is {# 0, # 2, # 3, # 1} and the number of segments to be divided is 2 (first segment and second segment). In this case, the UE may apply the RV notified by the PDCCH (or DCI) that schedules the PUSCH to the first segment, and apply the RV to the right of the RV to the second segment in the RV sequence. Good.

For example, if the RV notified by the PDCCH (or DCI) that schedules the PUSCH is 0, the UE determines that the RV of the first segment is 0 and the RV of the second segment is 2. May be good.

The RV sequence used is not limited to {# 0, # 2, # 3, # 1}. Other RV sequences such as {# 0, # 3, # 0, # 3} or {# 0, # 0, # 0, # 0} may be used. The RV sequence to be used may be defined in advance in the specifications, or may be notified from the base station to the UE by using upper layer signaling or the like.

In this way, when the RV of the segment of the divided PUSCH is determined based on a predetermined RV sequence, the decoding gain can be obtained by receiving all the segments.
[Predetermined condition 2]
The UE may select an RV to be applied to a plurality of segments divided from the original PUSCH from a specific RV value. The particular RV value may be a Self-decodable RV. The self-decoderable RV may be an RV containing a large number of bits related to system information (for example, RV = 0, 3) (see FIG. 8). By receiving the PUSCH to which the self-decoderable RV is applied, the probability that the RV can be decoded based on the PUSCH to which the RV is applied can be increased.

For example, assume that the number of segments to be divided is 2 (1st segment and 2nd segment). In this case, the UE applies the notified RV (or the notified RV and another specific RV) if the RV notified by the PDCCH (or DCI) that schedules the PUSCH is a specific RV. You may. For example, if the RV notified by the PDCCH (or DCI) that schedules the PUSCH is 0, the UE determines that the RV of the first segment is 0 and the RV of the second segment is another particular RV. It may be determined that 3 is.

On the other hand, the UE may apply the notified RV and the specific RV to each of the two segments if the RV notified by the PDCCH (or DCI) that schedules the PUSCH is not a specific RV. For example, in the repeated transmission of PUSCH, it is assumed that the second PUSCH transmission is divided into a plurality of segments. If the RV of the second PUSCH transmission (divided PUSCH) is 2 based on the PDCCH (or DCI) that schedules the repetition of the PUSCH, the UE determines that the RV of the first segment is 2. The RV of the second segment may be determined to be a specific RV of 0 or 3 (see FIG. 9).

Alternatively, the UE may apply a specific RV to a plurality of segments without applying the notified RV unless the RV notified by the PDCCH (or DCI) that schedules the PUSCH is a specific RV. ..

In this way, by applying the self-codeable RV, the decoding probability of the PUSCH to which the RV is applied can be improved, so that the communication quality (for example, SNR) can be improved.

<When changing the RV of the segment PUSCH and other PUSCH>
When dividing a part of the PUSCH that is repeatedly transmitted into a plurality of segments, the UE changes the RV of the divided segment from the RV set in the original PUSCH and then transmits the RV of the PUSCH. May also be changed. For example, the RV of the PUSCH transmitted after the PUSCH transmitted divided into a plurality of segments may be determined in the same manner as in the segment.

[Predetermined condition 3]
The RV applied to the non-divided PUSCH may be determined in consideration of the RV applied to the divided segment. For example, when selecting an RV to be applied to a segment divided based on a predetermined RV sequence (for example, an RV different from the original PUSCH), the remaining repeated PUSCHs after the segment PUSCH are also applied based on the predetermined RV sequence. The RV to be used may be determined.

For example, assume that the RV sequence is {# 0, # 2, # 3, # 1} and the number of segments to be divided is 2 (first segment and second segment). In this case, the UE applies the RV notified by the PDCCH (or DCI) that schedules the PUSCH to the first segment, and in the RV sequence the RV adjacent to the RV (eg, to the right) is the second. It may be applied to a segment.

For example, in the repeated transmission of PUSCH, it is assumed that the second PUSCH transmission is divided into a plurality of segments. If the RV of the second PUSCH transmission is 2 based on the PDCCH (or DCI) that schedules the repetition of the PUSCH, the UE determines that the RV of the first segment is 2, and the RV of the second segment. May be determined as 3. Further, the UE sets the RV applied to the PUSCH transmission following the segment to 1. In this case, the UE controls to apply a different RV even if the original RV for the PUSCH is 3. (See FIG. 10).

In this way, when the RV of the divided PUSCH segment is determined based on a predetermined RV sequence, the decoding gain can be obtained by receiving all the segments.

[Predetermined condition 4]
The RV applied to the divided segments may not be considered, and the RV applied to the PUSCH not divided may be determined. That is, the RV is determined separately for the divided segment PUSCH and the non-divided PUSCH.

For example, when selecting an RV to be applied to a segment divided based on a predetermined RV sequence (for example, an RV different from the original PUSCH), the PUSCH divided into a plurality of segments and the PUSCH not divided are each a predetermined RV. The RV to be applied may be determined based on the sequence.

For example, assume that the RV sequence is {# 0, # 2, # 3, # 1} and the number of segments to be divided is 2 (first segment and second segment). In this case, the UE applies the RV notified by the PDCCH (or DCI) that schedules the PUSCH to the first segment, and in the RV sequence the RV adjacent to the RV (eg, to the right) is the second. It may be applied to a segment. Further, the RV sequence may be applied to the PUSCH that is not divided into a plurality of segments (the PUSCH excluding the PUSCH that is divided into a plurality of segments).

For example, in the repeated transmission of PUSCH, it is assumed that the second PUSCH transmission is divided into a plurality of segments. If the RV notified by the PDCCH (or DCI) that schedules the repetition of the PUSCH is 0, the UE sets the RV applied to the first PUSCH transmission to 0.

On the other hand, in the second PUSCH transmission divided into a plurality of segments, the RV of the first segment may be determined to be 0, and the RV of the second segment may be determined to be 2. Further, the UE sets the RV applied to the PUSCH transmission following the segment to 2 (see FIG. 11). In this case, the UE controls to apply the RV sequence (for example, apply a different RV) except for the second PUSCH even if the original RV for the third PUSCH is 3.

<Variation>
The method for determining the RV to be applied to the PUSCH transmission may be selected based on predetermined conditions. The UE may select the RV determination method based on any of the following options A to D.

[Option A]
The RV determination method may be set based on the PUSCH scheduling type. For example, the UE may apply different RV determination methods for a dynamically scheduled grant-based PUSCH in DCI and a configuration grant-based PUSCH that is not dynamically scheduled in DCI. The RV determination method may be defined in the specifications, or may be set from the base station to the UE by higher layer signaling or the like.

[Option B]
The base station may notify the UE of the RV determination method using L1 signaling. For example, the UE may select the RV determination method based on at least one of the predetermined DCI fields transmitted from the base station, the DCI format, and the applied RNTI.

[Option C]
The RV determination method may be selected based on the TBS determination method (or the TBS determination method and the RV determination method may be associated). For example, when the UE uses the first TBS determination method (option 1-1), the UE may apply the first RV determination method (for example, predetermined condition 2 of 2-2).

[Option D]
The base station may notify the UE of the RV determination method using higher layer signaling. Alternatively, the RV determination method may be defined in advance in the specifications.

(Third aspect)
In the third aspect, when the PUSCH is divided into a plurality of segments and transmission is performed, a parameter related to overhead applied to each segment (for example, N ^PRB _oh ) will be described.

A parameter relating to overhead (eg, N ^PRB _oh ) indicates overhead from other signals (eg, CSI-RS, PT-RS, etc.). For example, N ^PRB _oh may indicate the number of resource elements (RE) of other signals in ^PRB , and N ^PRB _oh may be a value configured by a higher layer parameter. For example, N ^PRB _oh is the overhead indicated by the upper layer parameter (Xoh-PUSCH) and may be any value of 0, 6, 12 or 18. If Xoh-PUSCH is not set (notified) in the user terminal, Xoh-PUSCH may be set to 0. The UE may determine TBS or the like based on N ^PRB _oh .

When the UE divides a PUSCH (also called a nominal PUSCH) scheduled or allocated to a predetermined area or a predetermined transmission opportunity into a plurality of segments and transmits the PUSCH, the ^NPRB _oh applied to each segment after the division is based on a predetermined condition. To decide. For example, the UE may determine the N ^PRB _oh to apply to each segment based on at least one of the following options 3-1 to 3-4.

<Option 3-1>
The same N ^PRB _oh may be applied to a plurality of segments. For example, when the UE divides the PUSCH into a plurality of segments and transmits the PUSCH, it is assumed that the same ^NPRB _oh is used for each segment. Further, the N ^PRB _oh applied to each segment may be the N ^PRB _oh set in the PUSCH before division (for example, the original PUSCH).

The N ^PRB _{oh of the} original PUSCH may be notified by higher layer signaling (eg, xOverhead). For example, when the N ^PRB _oh notified by the upper layer signaling is 0 in X, the UE applies X as the N ^PRB _oh for a plurality of segments to divide and transmit the PUSCH.

In this way, the complexity of scheduling can be suppressed by determining the N ^PRB _oh to be applied to each segment based on the N ^PRB _oh set in PUSCH in advance.

<Option 3-2>
Different N ^PRB _oh may be applied to a plurality of segments. For example, when the UE divides the PUSCH into a plurality of segments and transmits the PUSCH, it is assumed that different N ^PRB _ohs are set for at least two segments out of the plurality of segments. Further, the N ^PRB _oh applied to at least one of the plurality of segments may be an N ^PRB _oh (original N ^PRB _oh ) set in the PUSCH before division (for example, the original PUSCH).

^N _{PRB oh} applied to other segments may be original ^N _{PRB oh} different ^N _{PRB oh.} Original ^N _{PRB oh} different ^N _{PRB oh} may be selected based on a predetermined condition. For example, the UE may determine an N ^PRB _oh different from the original N ^PRB _oh based on at least one of scheduling conditions, a predetermined DCI field, and higher layer signaling.

For example, when the N ^PRB _oh notified by the upper layer signaling is 6, the UE applies N ^PRB _oh = 6 to at least one of the plurality of segments to be transmitted by dividing the PUSCH, and applies N ^PRB _oh = 6 to the other segments. On the other hand, different N ^PRB _oh (for example, 0) may be applied. At least one of the plurality of segments (for example, the first segment) may be the first segment transmitted in the time direction.

<Option 3-3>
An N ^PRB _oh different from the N ^PRB _oh set in the PUSCH before division (for example, the original PUSCH) may be applied to a plurality of segments. In this case, the same N ^PRB _oh may be applied to the plurality of segments, or different N ^PRB _ohs may be applied.

If the same ^N _{PRB oh} for each segment ^(N _{PRB oh} different ^N _{PRB oh} set in the original PUSCH) is set, ^N _{PRB oh} may be selected to be applied based on a predetermined condition. For example, when the N ^PRB _oh notified by the upper layer signaling is 0, the UE applies a non-zero N ^PRB _oh (for example, N ^PRB _oh = 6) to a plurality of segments to be transmitted by dividing the PUSCH. You may.

If different ^N _{PRB oh} for each segment is set, ^N _{PRB oh} may be selected to be applied based on a predetermined condition. For example, the UE may apply a non-zero N ^PRB _oh to each segment when the N ^PRB _oh notified by the upper layer signaling is 0. For example, if the segment is two, the first segment (e.g., segment sent in the time direction the first) to ^N _{PRB oh} 6, the ^N _{PRB oh} the second segment may be 12.

In this way, by assuming N ^PRB _oh higher than the original N ^PRB _oh for the segment after division, excessive resource allocation caused by the mismatch of N ^PRB _oh , or application of a coding rate higher than the target code rate. Can be suppressed.
<Option 3-4>
A specific N ^PRB _oh may be applied to a plurality of segments. The specific N ^PRB _oh may be 0.

(Wireless communication system)
Hereinafter, the configuration of the wireless communication system according to the embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one of the wireless communication methods according to each of the above-described embodiments of the present disclosure or a combination thereof.

FIG. 12 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by Third Generation Partnership Project (3GPP). ..

Further, the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technology (RAT) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC is dual connectivity (E-UTRA-NR Dual Connectivity (EN-DC)) between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR, and dual connectivity between NR and LTE (NR-E). -UTRA Dual Connectivity (NE-DC)) may be included.

In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)). In NE-DC, the NR base station (gNB) is MN, and the LTE (E-UTRA) base station (eNB) is SN.

The wireless communication system 1 has dual connectivity between a plurality of base stations in the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) in which both MN and SN are NR base stations (gNB). )) May be supported.

The wireless communication system 1 includes a base station 11 that forms a macro cell C1 having a relatively wide coverage, and a base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. You may prepare. The user terminal 20 may be located in at least one cell. The arrangement, number, and the like of each cell and the user terminal 20 are not limited to the mode shown in the figure. Hereinafter, when the

base stations

11 and 12 are not distinguished, they are collectively referred to as the base station 10.

The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (Carrier Aggregation (CA)) and dual connectivity (DC) using a plurality of component carriers (Component Carrier (CC)).

Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1 and the small cell C2 may be included in FR2. For example, FR1 may be in a frequency band of 6 GHz or less (sub 6 GHz (sub-6 GHz)), and FR2 may be in a frequency band higher than 24 GHz (above-24 GHz). The frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

Further, the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

The plurality of base stations 10 may be connected by wire (for example, an optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between

base stations

11 and 12, the base station 11 corresponding to the upper station is an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to a relay station (relay) is IAB. It may be called a node.

The base station 10 may be connected to the core network 30 via another base station 10 or directly. The core network 30 may include at least one such as Evolved Packet Core (EPC), 5G Core Network (5GCN), and Next Generation Core (NGC).

The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, at least one of the downlink (Downlink (DL)) and the uplink (Uplink (UL)), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple. Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

The wireless access method may be called a waveform. In the wireless communication system 1, another wireless access system (for example, another single carrier transmission system, another multi-carrier transmission system) may be used as the UL and DL wireless access systems.

In the wireless communication system 1, as downlink channels, downlink shared channels (Physical Downlink Shared Channel (PDSCH)), broadcast channels (Physical Broadcast Channel (PBCH)), and downlink control channels (Physical Downlink Control) shared by each user terminal 20 are used. Channel (PDCCH)) and the like may be used.

Further, in the wireless communication system 1, as the uplink channel, the uplink shared channel (Physical Uplink Shared Channel (PUSCH)), the uplink control channel (Physical Uplink Control Channel (PUCCH)), and the random access channel shared by each user terminal 20 are used. (Physical Random Access Channel (PRACH)) or the like may be used.

User data, upper layer control information, System Information Block (SIB), etc. are transmitted by PDSCH. User data, upper layer control information, and the like may be transmitted by the PUSCH. In addition, Master Information Block (MIB) may be transmitted by PBCH.

Lower layer control information may be transmitted by PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of PDSCH and PUSCH.

The DCI that schedules PDSCH may be called DL assignment, DL DCI, etc., and the DCI that schedules PUSCH may be called UL grant, UL DCI, etc. The PDSCH may be read as DL data, and the PUSCH may be read as UL data.

A control resource set (COntrol REsource SET (CORESET)) and a search space (search space) may be used for detecting PDCCH. CORESET corresponds to a resource that searches for DCI. The search space corresponds to the search area and search method of PDCCH candidates (PDCCH candidates). One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a search space based on the search space settings.

One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. The "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", etc. of the present disclosure may be read as each other.

Depending on the PUCCH, channel state information (Channel State Information (CSI)), delivery confirmation information (for example, may be called Hybrid Automatic Repeat reQuest ACK knowledgement (HARQ-ACK), ACK / NACK, etc.) and scheduling request (Scheduling Request () Uplink Control Information (UCI) including at least one of SR)) may be transmitted. The PRACH may transmit a random access preamble for establishing a connection with the cell.

In this disclosure, downlinks, uplinks, etc. may be expressed without "links". Further, it may be expressed without adding "Physical" at the beginning of various channels.

In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like may be transmitted. In the wireless communication system 1, the DL-RS includes a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and a demodulation reference signal (DeModulation). Reference Signal (DMRS)), positioning reference signal (Positioning Reference Signal (PRS)), phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), and the like may be transmitted.

The synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). The signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be referred to as SS / PBCH block, SS Block (SSB) and the like. In addition, SS, SSB and the like may also be called a reference signal.

Further, in the wireless communication system 1, even if a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), or the like is transmitted as an uplink reference signal (Uplink Reference Signal (UL-RS)). Good. The DMRS may be called a user terminal specific reference signal (UE-specific Reference Signal).

(base station)
FIG. 13 is a diagram showing an example of the configuration of the base station according to the embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140. The control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may each be provided with one or more.

Note that, in this example, the functional blocks of the feature portion in the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each part described below may be omitted.

The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.

The control unit 110 may control signal generation, scheduling (for example, resource allocation, mapping) and the like. The control unit 110 may control transmission / reception, measurement, and the like using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140. The control unit 110 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of the communication channel, state management of the base station 10, management of radio resources, and the like.

The transmission / reception unit 120 may include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmitter / receiver 120 includes a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on common recognition in the technical fields according to the present disclosure. be able to.

The transmission / reception unit 120 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may be composed of a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

The transmitting / receiving antenna 130 can be composed of an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna.

The transmission / reception unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like. The transmission / reception unit 120 may receive the above-mentioned uplink channel, uplink reference signal, and the like.

The transmission / reception unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.

The transmission / reception unit 120 (transmission processing unit 1211) processes, for example, Packet Data Convergence Protocol (PDCP) layer processing and Radio Link Control (RLC) layer processing (for example, RLC) for data, control information, etc. acquired from control unit 110. RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. may be performed to generate a bit string to be transmitted.

The transmission / reception unit 120 (transmission processing unit 1211) performs channel coding (may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (Discrete Fourier Transform (DFT)) for the bit string to be transmitted. The base band signal may be output by performing processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, digital-analog conversion, and other transmission processing.

The transmission / reception unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. to the radio frequency band on the baseband signal, and transmit the signal in the radio frequency band via the transmission / reception antenna 130. ..

On the other hand, the transmission / reception unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 130.

The transmission / reception unit 120 (reception processing unit 1212) performs analog-digital conversion, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) on the acquired baseband signal. )) Processing (if necessary), filtering, decoding, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing are applied. User data and the like may be acquired.

The transmission / reception unit 120 (measurement unit 123) may perform measurement on the received signal. For example, the measuring unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, or the like based on the received signal. The measuring unit 123 has received power (for example, Reference Signal Received Power (RSRP)) and reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)). , Signal strength (for example, Received Signal Strength Indicator (RSSI)), propagation path information (for example, CSI), and the like may be measured. The measurement result may be output to the control unit 110.

The transmission line interface 140 transmits / receives signals (backhaul signaling) to / from a device included in the core network 30, another base station 10 and the like, and provides user data (user plane data) and control plane for the user terminal 20. Data or the like may be acquired or transmitted.

The transmitting unit and the receiving unit of the base station 10 in the present disclosure may be composed of at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140.

The transmission / reception unit 120 transmits information instructing transmission of the uplink shared channel. Further, the transmission / reception unit 120 may transmit at least one of the number of repetitions, information on TBS, information on RV, and information on overhead.

When the UE divides the uplink shared channel into a plurality of segments for transmission, the control unit 110 applies a transmission condition different from the transmission condition set for transmission of the uplink shared channel to at least one segment. You may control it.

When the UE divides the uplink shared channel into a plurality of segments for transmission, the control unit 110 has a redundant version different from the redundant version set for transmission of the uplink shared channel for at least one segment, or the same redundant version. It may be controlled to be applied.

(User terminal)
FIG. 14 is a diagram showing an example of the configuration of the user terminal according to the embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. The control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided with one or more.

Note that this example mainly shows the functional blocks of the feature portion in the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each part described below may be omitted.

The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.

The control unit 210 may control signal generation, mapping, and the like. The control unit 210 may control transmission / reception, measurement, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 220.

The transmission / reception unit 220 may include a baseband unit 221 and an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitter / receiver 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on the common recognition in the technical field according to the present disclosure.

The transmission / reception unit 220 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

The transmitting / receiving antenna 230 can be composed of an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna.

The transmission / reception unit 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like. The transmission / reception unit 220 may transmit the above-mentioned uplink channel, uplink reference signal, and the like.

The transmission / reception unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.

The transmission / reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (for example, RLC retransmission control), and MAC layer processing (for example, for data, control information, etc. acquired from the control unit 210). , HARQ retransmission control), etc., to generate a bit string to be transmitted.

The transmission / reception unit 220 (transmission processing unit 2211) performs channel coding (may include error correction coding), modulation, mapping, filtering processing, DFT processing (if necessary), and IFFT processing for the bit string to be transmitted. , Precoding, digital-to-analog conversion, and other transmission processing may be performed to output the baseband signal.

Whether or not to apply the DFT process may be based on the transform precoding setting. The transmission / reception unit 220 (transmission processing unit 2211) described above for transmitting a channel (for example, PUSCH) using the DFT-s-OFDM waveform when the transform precoding is enabled. The DFT process may be performed as the transmission process, and if not, the DFT process may not be performed as the transmission process.

The transmission / reception unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. to the radio frequency band on the baseband signal, and transmit the signal in the radio frequency band via the transmission / reception antenna 230. ..

On the other hand, the transmission / reception unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 230.

The transmission / reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering processing, demapping, demodulation, and decoding (error correction) for the acquired baseband signal. Decoding may be included), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.

The transmission / reception unit 220 (measurement unit 223) may perform measurement on the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, or the like based on the received signal. The measuring unit 223 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement result may be output to the control unit 210.

The transmitter and receiver of the user terminal 20 in the present disclosure may be composed of at least one of the transmitter / receiver 220 and the transmitter / receiver antenna 230.

Note that the transmission / reception unit 220 receives information instructing transmission of the uplink shared channel. In addition, the transmission / reception unit 220 may receive at least one of the number of repetitions, information on TBS, information on RV, and information on overhead.

When the uplink shared channel is divided into a plurality of segments for transmission, the control unit 210 controls so as to apply transmission conditions different from the transmission conditions set for transmission of the uplink shared channel to at least one segment. May be good.

For example, the control unit 210 may control the frequency resource used for transmission of at least one segment to be larger than the frequency resource set for transmission of the uplink shared channel. Alternatively, the control unit 210 sets at least one of the modulation coding methods and modulation orders used for transmission of at least one segment to at least one of the modulation coding methods and modulation orders set for transmission of the uplink shared channel. It may be controlled to change from. Alternatively, the control unit 210 may control the spatial resources used for transmission of at least one segment to be larger than the spatial resources set for transmission of the uplink shared channel. The plurality of segments may be arranged in different slots.

Further, when the uplink shared channel is divided into a plurality of segments and transmitted, the control unit 210 sets the redundant version different from the redundant version set in the uplink shared channel and the uplink shared channel for at least one segment. It may be controlled to apply at least one value different from the parameter value regarding the overhead to be set. Alternatively, when the uplink shared channel is divided into a plurality of segments and transmitted, the control unit 210 is set to the same redundant version as the redundant version set in the uplink shared channel and the uplink shared channel for the plurality of segments. It may be controlled to apply at least one of the same values as the parameter values related to the overhead.

For example, the control unit 210 may apply at least one of a specific redundant version and a specific overhead parameter value to at least one of a plurality of segments. Further, when the control unit 210 divides a part of the uplink shared channels into a plurality of segments and transmits the plurality of uplink shared channels that are repeatedly transmitted, the control unit 210 transmits the uplink shared channels without dividing the uplink into a plurality of segments. The same redundant version as the redundant version set for transmission of the upstream shared channel may be applied. Alternatively, when the control unit 210 divides a part of the uplink shared channels into a plurality of segments and transmits the plurality of uplink shared channels that are repeatedly transmitted, the control unit 210 transmits the uplink shared channels without dividing the uplink into a plurality of segments. A redundant version different from the redundant version set for transmission of the upstream shared channel may be applied.

(Hardware configuration)
The block diagram used in the description of the above embodiment shows a block of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by using two or more physically or logically separated devices). , Wired, wireless, etc.) and may be realized using these plurality of devices. The functional block may be realized by combining the software with the one device or the plurality of devices.

Here, the functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. Not limited. For example, a functional block (constituent unit) for functioning transmission may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like. As described above, the method of realizing each of them is not particularly limited.

For example, the base station, user terminal, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. FIG. 15 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment. The base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. ..

In the present disclosure, the terms of devices, circuits, devices, sections, units, etc. can be read as each other. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.

For example, although only one processor 1001 is shown, there may be a plurality of processors. Further, the processing may be executed by one processor, or the processing may be executed simultaneously, sequentially, or by using other methods by two or more processors. The processor 1001 may be mounted by one or more chips.

For each function of the base station 10 and the user terminal 20, for example, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an operation and communicates via the communication device 1004. It is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

The processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, registers, and the like. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), and the like may be realized by the processor 1001.

Further, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized in the same manner for other functional blocks.

The memory 1002 is a computer-readable recording medium, for example, at least a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), or any other suitable storage medium. It may be composed of one. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can be executed to implement the wireless communication method according to the embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disc (Compact Disc ROM (CD-ROM)), a digital versatile disk, etc.). At least one of Blu-ray® disks, removable disks, hard disk drives, smart cards, flash memory devices (eg cards, sticks, key drives), magnetic stripes, databases, servers, and other suitable storage media. It may be composed of. The storage 1003 may be referred to as an auxiliary storage device.

The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)). It may be configured to include. For example, the transmission / reception unit 120 (220), the transmission / reception antenna 130 (230), and the like described above may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be physically or logically separated from the transmission unit 120a (220a) and the reception unit 120b (220b).

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information. The bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.

Further, the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (Digital Signal Processor (DSP)), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and the like. It may be configured to include hardware, and a part or all of each functional block may be realized by using the hardware. For example, processor 1001 may be implemented using at least one of these hardware.

(Modification example)
The terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, channels, symbols and signals (signals or signaling) may be read interchangeably. Also, the signal may be a message. The reference signal can also be abbreviated as RS, and may be called a pilot, a pilot signal, or the like depending on the applied standard. Further, the component carrier (Component Carrier (CC)) may be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

The wireless frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the wireless frame may be referred to as a subframe. Further, the subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that is independent of numerology.

Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel. Numerology includes, for example, subcarrier spacing (SubCarrier Spacing (SCS)), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval (TTI)), number of symbols per TTI, and wireless frame configuration. , A specific filtering process performed by the transmitter / receiver in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like may be indicated.

The slot may be composed of one or more symbols in the time domain (Orthogonal Frequency Division Multiple Access (OFDMA) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.). Further, the slot may be a time unit based on numerology.

The slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain. Further, the mini slot may be called a sub slot. A minislot may consist of a smaller number of symbols than the slot. A PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as a PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (PUSCH) mapping type B.

The wireless frame, subframe, slot, mini slot and symbol all represent the time unit when transmitting a signal. The radio frame, subframe, slot, minislot and symbol may have different names corresponding to each. The time units such as frames, subframes, slots, mini slots, and symbols in the present disclosure may be read as each other.

For example, one subframe may be called TTI, a plurality of consecutive subframes may be called TTI, and one slot or one minislot may be called TTI. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. It may be. The unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.

Here, TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate radio resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units. The definition of TTI is not limited to this.

The TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation. When a TTI is given, the time interval (for example, the number of symbols) to which the transport block, code block, code word, etc. are actually mapped may be shorter than the TTI.

When one slot or one mini slot is called TTI, one or more TTIs (that is, one or more slots or one or more mini slots) may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like. TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.

The long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.

A resource block (Resource Block (RB)) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain. The number of subcarriers contained in the RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers contained in the RB may be determined based on numerology.

Further, the RB may include one or more symbols in the time domain, and may have a length of 1 slot, 1 mini slot, 1 subframe or 1 TTI. Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.

In addition, one or more RBs are a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, and an RB. It may be called a pair or the like.

Further, the resource block may be composed of one or a plurality of resource elements (Resource Element (RE)). For example, 1RE may be a radio resource area of 1 subcarrier and 1 symbol.

Bandwidth Part (BWP) (which may also be called partial bandwidth) represents a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. May be good. Here, the common RB may be specified by the index of the RB with respect to the common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

The BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL). One or more BWPs may be set in one carrier for the UE.

At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP. In addition, "cell", "carrier" and the like in this disclosure may be read as "BWP".

Note that the above-mentioned structures such as wireless frames, subframes, slots, mini slots, and symbols are merely examples. For example, the number of subframes contained in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in the RB. The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented. For example, radio resources may be indicated by a given index.

The names used for parameters, etc. in this disclosure are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not limiting in any way. ..

The information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.

In addition, information, signals, etc. can be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layers. Information, signals, etc. may be input / output via a plurality of network nodes.

Input / output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information, signals, etc. can be overwritten, updated, or added. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.

The notification of information is not limited to the mode / embodiment described in the present disclosure, and may be performed by using another method. For example, the notification of information in the present disclosure includes physical layer signaling (for example, downlink control information (DCI)), uplink control information (Uplink Control Information (UCI))), and higher layer signaling (for example, Radio Resource Control). (RRC) signaling, broadcast information (master information block (MIB), system information block (SIB), etc.), medium access control (MAC) signaling), other signals or combinations thereof May be carried out by.

Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like. Further, the RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like. Further, MAC signaling may be notified using, for example, a MAC control element (MAC Control Element (CE)).

In addition, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit notification, but implicitly (for example, by not notifying the predetermined information or another information). May be done (by notification of).

The determination may be made by a value represented by 1 bit (0 or 1), or by a boolean value represented by true or false. , May be done by numerical comparison (eg, comparison with a given value).

Software is an instruction, instruction set, code, code segment, program code, program, subprogram, software module, whether called software, firmware, middleware, microcode, hardware description language, or another name. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted to mean.

In addition, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, a website where software uses at least one of wired technology (coaxial cable, fiber optic cable, twist pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.). When transmitted from a server, or other remote source, at least one of these wired and wireless technologies is included within the definition of transmission medium.

The terms "system" and "network" used in this disclosure may be used interchangeably. "Network" may mean a device (eg, a base station) included in the network.

In the present disclosure, "precoding", "precoder", "weight (precoding weight)", "pseudo-colocation (Quasi-Co-Location (QCL))", "Transmission Configuration Indication state (TCI state)", "space". "Spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", Terms such as "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel" are compatible. Can be used for

In the present disclosure, "base station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "Access point", "Transmission point (Transmission Point (TP))", "Reception point (Reception Point (RP))", "Transmission / reception point (Transmission / Reception Point (TRP))", "Panel" , "Cell", "sector", "cell group", "carrier", "component carrier" and the like can be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

The base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (Remote Radio)). Communication services can also be provided by Head (RRH))). The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage.

In this disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" are used interchangeably. Can be done.

Mobile stations include subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals. , Handset, user agent, mobile client, client or some other suitable term.

At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be. It should be noted that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

Further, the base station in the present disclosure may be read by the user terminal. For example, communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the user terminal 20 may have the function of the base station 10 described above. In addition, words such as "up" and "down" may be read as words corresponding to communication between terminals (for example, "side"). For example, the uplink, downlink, and the like may be read as side channels.

Similarly, the user terminal in the present disclosure may be read as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

In the present disclosure, the operation performed by the base station may be performed by its upper node (upper node) in some cases. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal are performed by the base station and one or more network nodes other than the base station (for example,). Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. can be considered, but it is not limited to these), or it is clear that it can be performed by a combination thereof.

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution. In addition, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.

Each aspect / embodiment described in the present disclosure includes Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system ( 4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), LTE 802. 20, Ultra-WideBand (UWB), Bluetooth®, other systems that utilize suitable wireless communication methods, next-generation systems extended based on these, and the like. In addition, a plurality of systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

The phrase "based on" as used in this disclosure does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

Any reference to elements using designations such as "first", "second", etc. as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted or that the first element must somehow precede the second element.

The term "determining" used in this disclosure may include a wide variety of actions. For example, "judgment (decision)" means judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry) ( For example, searching in a table, database or another data structure), ascertaining, etc. may be considered to be "judgment".

In addition, "judgment (decision)" means receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access (for example). It may be regarded as "judgment (decision)" of "accessing" (for example, accessing data in memory).

In addition, "judgment (decision)" is regarded as "judgment (decision)" of solving, selecting, choosing, establishing, comparing, and the like. May be good. That is, "judgment (decision)" may be regarded as "judgment (decision)" of some action.

In addition, "judgment (decision)" may be read as "assuming", "expecting", "considering", and the like.

The terms "connected", "coupled", or any variation thereof, as used herein, are any direct or indirect connection or connection between two or more elements. Means, and can include the presence of one or more intermediate elements between two elements that are "connected" or "joined" to each other. The connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access".

In the present disclosure, when two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-comprehensive examples, the radio frequency domain, microwaves. It can be considered to be "connected" or "coupled" to each other using frequency, electromagnetic energy having wavelengths in the light (both visible and invisible) regions, and the like.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". The term may mean that "A and B are different from C". Terms such as "separate" and "combined" may be interpreted in the same way as "different".

When "include", "including" and variations thereof are used in the present disclosure, these terms are as comprehensive as the term "comprising". Is intended. Furthermore, the term "or" used in the present disclosure is intended not to be an exclusive OR.

In the present disclosure, if articles are added by translation, for example, a, an and the in English, the disclosure may include that the nouns following these articles are in the plural.

Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as a modified or modified mode without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for purposes of illustration and does not bring any limiting meaning to the invention according to the present disclosure.

Claims

A receiver that receives information instructing transmission of the uplink shared channel,
When the uplink shared channel is divided into a plurality of segments and transmitted, parameters relating to a redundant version different from the redundant version set in the uplink shared channel and the overhead set in the uplink shared channel are set for at least one segment. A terminal characterized by having a control unit that controls to apply at least one of a value different from the value.
The terminal according to claim 1, wherein the control unit applies at least one of a specific redundant version and a parameter value related to a specific overhead to at least one of the plurality of segments.
When the control unit divides a part of the uplink shared channels into a plurality of segments and transmits the plurality of uplink shared channels that are repeatedly transmitted, the control unit refers to the uplink shared channel that is transmitted without being divided into the plurality of segments. The terminal according to claim 1 or 2, wherein the same redundant version as the redundant version set for transmission of the uplink shared channel is applied.
When the control unit divides a part of the uplink shared channels into a plurality of segments and transmits the plurality of uplink shared channels that are repeatedly transmitted, the control unit refers to the uplink shared channel that is transmitted without being divided into the plurality of segments. The terminal according to claim 1 or 2, wherein a redundant version different from the redundant version set for transmission of the uplink shared channel is applied.
A receiver that receives information instructing transmission of the uplink shared channel,
When the uplink shared channel is divided into a plurality of segments and transmitted, the same redundant version as the redundant version set in the uplink shared channel and the overhead set in the uplink shared channel are related to the plurality of segments. A terminal characterized by having a control unit that controls to apply at least one of the same values as a parameter value.
The process of receiving information instructing transmission of the uplink shared channel, and
When the uplink shared channel is divided into a plurality of segments and transmitted, parameters relating to a redundant version different from the redundant version set in the uplink shared channel and the overhead set in the uplink shared channel are set for at least one segment. A wireless communication method comprising: a step of controlling to apply at least one of a value different from a value.